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linux/drivers/input/rmi4/rmi_spi.c
Kees Cook a86854d0c5 treewide: devm_kzalloc() -> devm_kcalloc() 
The devm_kzalloc() function has a 2-factor argument form, devm_kcalloc().
This patch replaces cases of:

        devm_kzalloc(handle, a * b, gfp)

with:
        devm_kcalloc(handle, a * b, gfp)

as well as handling cases of:

        devm_kzalloc(handle, a * b * c, gfp)

with:

        devm_kzalloc(handle, array3_size(a, b, c), gfp)

as it's slightly less ugly than:

        devm_kcalloc(handle, array_size(a, b), c, gfp)

This does, however, attempt to ignore constant size factors like:

        devm_kzalloc(handle, 4 * 1024, gfp)

though any constants defined via macros get caught up in the conversion.

Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.

Some manual whitespace fixes were needed in this patch, as Coccinelle
really liked to write "=devm_kcalloc..." instead of "= devm_kcalloc...".

The Coccinelle script used for this was:

// Fix redundant parens around sizeof().
@@
expression HANDLE;
type TYPE;
expression THING, E;
@@

(
  devm_kzalloc(HANDLE,
-	(sizeof(TYPE)) * E
+	sizeof(TYPE) * E
  , ...)
|
  devm_kzalloc(HANDLE,
-	(sizeof(THING)) * E
+	sizeof(THING) * E
  , ...)
)

// Drop single-byte sizes and redundant parens.
@@
expression HANDLE;
expression COUNT;
typedef u8;
typedef __u8;
@@

(
  devm_kzalloc(HANDLE,
-	sizeof(u8) * (COUNT)
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(__u8) * (COUNT)
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(char) * (COUNT)
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(unsigned char) * (COUNT)
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(u8) * COUNT
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(__u8) * COUNT
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(char) * COUNT
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(unsigned char) * COUNT
+	COUNT
  , ...)
)

// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
expression HANDLE;
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@

(
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * (COUNT_ID)
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * COUNT_ID
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * (COUNT_CONST)
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * COUNT_CONST
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * (COUNT_ID)
+	COUNT_ID, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * COUNT_ID
+	COUNT_ID, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * (COUNT_CONST)
+	COUNT_CONST, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * COUNT_CONST
+	COUNT_CONST, sizeof(THING)
  , ...)
)

// 2-factor product, only identifiers.
@@
expression HANDLE;
identifier SIZE, COUNT;
@@

- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	SIZE * COUNT
+	COUNT, SIZE
  , ...)

// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression HANDLE;
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@

(
  devm_kzalloc(HANDLE,
-	sizeof(TYPE) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
)

// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression HANDLE;
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@

(
  devm_kzalloc(HANDLE,
-	sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
)

// 3-factor product, only identifiers, with redundant parens removed.
@@
expression HANDLE;
identifier STRIDE, SIZE, COUNT;
@@

(
  devm_kzalloc(HANDLE,
-	(COUNT) * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	COUNT * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	COUNT * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(COUNT) * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	COUNT * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(COUNT) * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(COUNT) * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	COUNT * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
)

// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression HANDLE;
expression E1, E2, E3;
constant C1, C2, C3;
@@

(
  devm_kzalloc(HANDLE, C1 * C2 * C3, ...)
|
  devm_kzalloc(HANDLE,
-	(E1) * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(E1) * (E2) * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(E1) * (E2) * (E3)
+	array3_size(E1, E2, E3)
  , ...)
|
  devm_kzalloc(HANDLE,
-	E1 * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
)

// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression HANDLE;
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@

(
  devm_kzalloc(HANDLE, sizeof(THING) * C2, ...)
|
  devm_kzalloc(HANDLE, sizeof(TYPE) * C2, ...)
|
  devm_kzalloc(HANDLE, C1 * C2 * C3, ...)
|
  devm_kzalloc(HANDLE, C1 * C2, ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * (E2)
+	E2, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * E2
+	E2, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * (E2)
+	E2, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * E2
+	E2, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	(E1) * E2
+	E1, E2
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	(E1) * (E2)
+	E1, E2
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	E1 * E2
+	E1, E2
  , ...)
)

Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 16:19:22 -07:00

535 lines
12 KiB
C
Raw Blame History

/*
* Copyright (c) 2011-2016 Synaptics Incorporated
* Copyright (c) 2011 Unixphere
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/rmi.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/of.h>
#include "rmi_driver.h"
#define RMI_SPI_DEFAULT_XFER_BUF_SIZE 64
#define RMI_PAGE_SELECT_REGISTER 0x00FF
#define RMI_SPI_PAGE(addr) (((addr) >> 8) & 0x80)
#define RMI_SPI_XFER_SIZE_LIMIT 255
#define BUFFER_SIZE_INCREMENT 32
enum rmi_spi_op {
RMI_SPI_WRITE = 0,
RMI_SPI_READ,
RMI_SPI_V2_READ_UNIFIED,
RMI_SPI_V2_READ_SPLIT,
RMI_SPI_V2_WRITE,
};
struct rmi_spi_cmd {
enum rmi_spi_op op;
u16 addr;
};
struct rmi_spi_xport {
struct rmi_transport_dev xport;
struct spi_device *spi;
struct mutex page_mutex;
int page;
u8 *rx_buf;
u8 *tx_buf;
int xfer_buf_size;
struct spi_transfer *rx_xfers;
struct spi_transfer *tx_xfers;
int rx_xfer_count;
int tx_xfer_count;
};
static int rmi_spi_manage_pools(struct rmi_spi_xport *rmi_spi, int len)
{
struct spi_device *spi = rmi_spi->spi;
int buf_size = rmi_spi->xfer_buf_size
? rmi_spi->xfer_buf_size : RMI_SPI_DEFAULT_XFER_BUF_SIZE;
struct spi_transfer *xfer_buf;
void *buf;
void *tmp;
while (buf_size < len)
buf_size *= 2;
if (buf_size > RMI_SPI_XFER_SIZE_LIMIT)
buf_size = RMI_SPI_XFER_SIZE_LIMIT;
tmp = rmi_spi->rx_buf;
buf = devm_kcalloc(&spi->dev, buf_size, 2,
GFP_KERNEL | GFP_DMA);
if (!buf)
return -ENOMEM;
rmi_spi->rx_buf = buf;
rmi_spi->tx_buf = &rmi_spi->rx_buf[buf_size];
rmi_spi->xfer_buf_size = buf_size;
if (tmp)
devm_kfree(&spi->dev, tmp);
if (rmi_spi->xport.pdata.spi_data.read_delay_us)
rmi_spi->rx_xfer_count = buf_size;
else
rmi_spi->rx_xfer_count = 1;
if (rmi_spi->xport.pdata.spi_data.write_delay_us)
rmi_spi->tx_xfer_count = buf_size;
else
rmi_spi->tx_xfer_count = 1;
/*
* Allocate a pool of spi_transfer buffers for devices which need
* per byte delays.
*/
tmp = rmi_spi->rx_xfers;
xfer_buf = devm_kcalloc(&spi->dev,
rmi_spi->rx_xfer_count + rmi_spi->tx_xfer_count,
sizeof(struct spi_transfer),
GFP_KERNEL);
if (!xfer_buf)
return -ENOMEM;
rmi_spi->rx_xfers = xfer_buf;
rmi_spi->tx_xfers = &xfer_buf[rmi_spi->rx_xfer_count];
if (tmp)
devm_kfree(&spi->dev, tmp);
return 0;
}
static int rmi_spi_xfer(struct rmi_spi_xport *rmi_spi,
const struct rmi_spi_cmd *cmd, const u8 *tx_buf,
int tx_len, u8 *rx_buf, int rx_len)
{
struct spi_device *spi = rmi_spi->spi;
struct rmi_device_platform_data_spi *spi_data =
&rmi_spi->xport.pdata.spi_data;
struct spi_message msg;
struct spi_transfer *xfer;
int ret = 0;
int len;
int cmd_len = 0;
int total_tx_len;
int i;
u16 addr = cmd->addr;
spi_message_init(&msg);
switch (cmd->op) {
case RMI_SPI_WRITE:
case RMI_SPI_READ:
cmd_len += 2;
break;
case RMI_SPI_V2_READ_UNIFIED:
case RMI_SPI_V2_READ_SPLIT:
case RMI_SPI_V2_WRITE:
cmd_len += 4;
break;
}
total_tx_len = cmd_len + tx_len;
len = max(total_tx_len, rx_len);
if (len > RMI_SPI_XFER_SIZE_LIMIT)
return -EINVAL;
if (rmi_spi->xfer_buf_size < len) {
ret = rmi_spi_manage_pools(rmi_spi, len);
if (ret < 0)
return ret;
}
if (addr == 0)
/*
* SPI needs an address. Use 0x7FF if we want to keep
* reading from the last position of the register pointer.
*/
addr = 0x7FF;
switch (cmd->op) {
case RMI_SPI_WRITE:
rmi_spi->tx_buf[0] = (addr >> 8);
rmi_spi->tx_buf[1] = addr & 0xFF;
break;
case RMI_SPI_READ:
rmi_spi->tx_buf[0] = (addr >> 8) | 0x80;
rmi_spi->tx_buf[1] = addr & 0xFF;
break;
case RMI_SPI_V2_READ_UNIFIED:
break;
case RMI_SPI_V2_READ_SPLIT:
break;
case RMI_SPI_V2_WRITE:
rmi_spi->tx_buf[0] = 0x40;
rmi_spi->tx_buf[1] = (addr >> 8) & 0xFF;
rmi_spi->tx_buf[2] = addr & 0xFF;
rmi_spi->tx_buf[3] = tx_len;
break;
}
if (tx_buf)
memcpy(&rmi_spi->tx_buf[cmd_len], tx_buf, tx_len);
if (rmi_spi->tx_xfer_count > 1) {
for (i = 0; i < total_tx_len; i++) {
xfer = &rmi_spi->tx_xfers[i];
memset(xfer, 0, sizeof(struct spi_transfer));
xfer->tx_buf = &rmi_spi->tx_buf[i];
xfer->len = 1;
xfer->delay_usecs = spi_data->write_delay_us;
spi_message_add_tail(xfer, &msg);
}
} else {
xfer = rmi_spi->tx_xfers;
memset(xfer, 0, sizeof(struct spi_transfer));
xfer->tx_buf = rmi_spi->tx_buf;
xfer->len = total_tx_len;
spi_message_add_tail(xfer, &msg);
}
rmi_dbg(RMI_DEBUG_XPORT, &spi->dev, "%s: cmd: %s tx_buf len: %d tx_buf: %*ph\n",
__func__, cmd->op == RMI_SPI_WRITE ? "WRITE" : "READ",
total_tx_len, total_tx_len, rmi_spi->tx_buf);
if (rx_buf) {
if (rmi_spi->rx_xfer_count > 1) {
for (i = 0; i < rx_len; i++) {
xfer = &rmi_spi->rx_xfers[i];
memset(xfer, 0, sizeof(struct spi_transfer));
xfer->rx_buf = &rmi_spi->rx_buf[i];
xfer->len = 1;
xfer->delay_usecs = spi_data->read_delay_us;
spi_message_add_tail(xfer, &msg);
}
} else {
xfer = rmi_spi->rx_xfers;
memset(xfer, 0, sizeof(struct spi_transfer));
xfer->rx_buf = rmi_spi->rx_buf;
xfer->len = rx_len;
spi_message_add_tail(xfer, &msg);
}
}
ret = spi_sync(spi, &msg);
if (ret < 0) {
dev_err(&spi->dev, "spi xfer failed: %d\n", ret);
return ret;
}
if (rx_buf) {
memcpy(rx_buf, rmi_spi->rx_buf, rx_len);
rmi_dbg(RMI_DEBUG_XPORT, &spi->dev, "%s: (%d) %*ph\n",
__func__, rx_len, rx_len, rx_buf);
}
return 0;
}
/*
* rmi_set_page - Set RMI page
* @xport: The pointer to the rmi_transport_dev struct
* @page: The new page address.
*
* RMI devices have 16-bit addressing, but some of the transport
* implementations (like SMBus) only have 8-bit addressing. So RMI implements
* a page address at 0xff of every page so we can reliable page addresses
* every 256 registers.
*
* The page_mutex lock must be held when this function is entered.
*
* Returns zero on success, non-zero on failure.
*/
static int rmi_set_page(struct rmi_spi_xport *rmi_spi, u8 page)
{
struct rmi_spi_cmd cmd;
int ret;
cmd.op = RMI_SPI_WRITE;
cmd.addr = RMI_PAGE_SELECT_REGISTER;
ret = rmi_spi_xfer(rmi_spi, &cmd, &page, 1, NULL, 0);
if (ret)
rmi_spi->page = page;
return ret;
}
static int rmi_spi_write_block(struct rmi_transport_dev *xport, u16 addr,
const void *buf, size_t len)
{
struct rmi_spi_xport *rmi_spi =
container_of(xport, struct rmi_spi_xport, xport);
struct rmi_spi_cmd cmd;
int ret;
mutex_lock(&rmi_spi->page_mutex);
if (RMI_SPI_PAGE(addr) != rmi_spi->page) {
ret = rmi_set_page(rmi_spi, RMI_SPI_PAGE(addr));
if (ret)
goto exit;
}
cmd.op = RMI_SPI_WRITE;
cmd.addr = addr;
ret = rmi_spi_xfer(rmi_spi, &cmd, buf, len, NULL, 0);
exit:
mutex_unlock(&rmi_spi->page_mutex);
return ret;
}
static int rmi_spi_read_block(struct rmi_transport_dev *xport, u16 addr,
void *buf, size_t len)
{
struct rmi_spi_xport *rmi_spi =
container_of(xport, struct rmi_spi_xport, xport);
struct rmi_spi_cmd cmd;
int ret;
mutex_lock(&rmi_spi->page_mutex);
if (RMI_SPI_PAGE(addr) != rmi_spi->page) {
ret = rmi_set_page(rmi_spi, RMI_SPI_PAGE(addr));
if (ret)
goto exit;
}
cmd.op = RMI_SPI_READ;
cmd.addr = addr;
ret = rmi_spi_xfer(rmi_spi, &cmd, NULL, 0, buf, len);
exit:
mutex_unlock(&rmi_spi->page_mutex);
return ret;
}
static const struct rmi_transport_ops rmi_spi_ops = {
.write_block = rmi_spi_write_block,
.read_block = rmi_spi_read_block,
};
#ifdef CONFIG_OF
static int rmi_spi_of_probe(struct spi_device *spi,
struct rmi_device_platform_data *pdata)
{
struct device *dev = &spi->dev;
int retval;
retval = rmi_of_property_read_u32(dev,
&pdata->spi_data.read_delay_us,
"spi-rx-delay-us", 1);
if (retval)
return retval;
retval = rmi_of_property_read_u32(dev,
&pdata->spi_data.write_delay_us,
"spi-tx-delay-us", 1);
if (retval)
return retval;
return 0;
}
static const struct of_device_id rmi_spi_of_match[] = {
{ .compatible = "syna,rmi4-spi" },
{},
};
MODULE_DEVICE_TABLE(of, rmi_spi_of_match);
#else
static inline int rmi_spi_of_probe(struct spi_device *spi,
struct rmi_device_platform_data *pdata)
{
return -ENODEV;
}
#endif
static void rmi_spi_unregister_transport(void *data)
{
struct rmi_spi_xport *rmi_spi = data;
rmi_unregister_transport_device(&rmi_spi->xport);
}
static int rmi_spi_probe(struct spi_device *spi)
{
struct rmi_spi_xport *rmi_spi;
struct rmi_device_platform_data *pdata;
struct rmi_device_platform_data *spi_pdata = spi->dev.platform_data;
int error;
if (spi->master->flags & SPI_MASTER_HALF_DUPLEX)
return -EINVAL;
rmi_spi = devm_kzalloc(&spi->dev, sizeof(struct rmi_spi_xport),
GFP_KERNEL);
if (!rmi_spi)
return -ENOMEM;
pdata = &rmi_spi->xport.pdata;
if (spi->dev.of_node) {
error = rmi_spi_of_probe(spi, pdata);
if (error)
return error;
} else if (spi_pdata) {
*pdata = *spi_pdata;
}
if (pdata->spi_data.bits_per_word)
spi->bits_per_word = pdata->spi_data.bits_per_word;
if (pdata->spi_data.mode)
spi->mode = pdata->spi_data.mode;
error = spi_setup(spi);
if (error < 0) {
dev_err(&spi->dev, "spi_setup failed!\n");
return error;
}
pdata->irq = spi->irq;
rmi_spi->spi = spi;
mutex_init(&rmi_spi->page_mutex);
rmi_spi->xport.dev = &spi->dev;
rmi_spi->xport.proto_name = "spi";
rmi_spi->xport.ops = &rmi_spi_ops;
spi_set_drvdata(spi, rmi_spi);
error = rmi_spi_manage_pools(rmi_spi, RMI_SPI_DEFAULT_XFER_BUF_SIZE);
if (error)
return error;
/*
* Setting the page to zero will (a) make sure the PSR is in a
* known state, and (b) make sure we can talk to the device.
*/
error = rmi_set_page(rmi_spi, 0);
if (error) {
dev_err(&spi->dev, "Failed to set page select to 0.\n");
return error;
}
dev_info(&spi->dev, "registering SPI-connected sensor\n");
error = rmi_register_transport_device(&rmi_spi->xport);
if (error) {
dev_err(&spi->dev, "failed to register sensor: %d\n", error);
return error;
}
error = devm_add_action_or_reset(&spi->dev,
rmi_spi_unregister_transport,
rmi_spi);
if (error)
return error;
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int rmi_spi_suspend(struct device *dev)
{
struct spi_device *spi = to_spi_device(dev);
struct rmi_spi_xport *rmi_spi = spi_get_drvdata(spi);
int ret;
ret = rmi_driver_suspend(rmi_spi->xport.rmi_dev, true);
if (ret)
dev_warn(dev, "Failed to resume device: %d\n", ret);
return ret;
}
static int rmi_spi_resume(struct device *dev)
{
struct spi_device *spi = to_spi_device(dev);
struct rmi_spi_xport *rmi_spi = spi_get_drvdata(spi);
int ret;
ret = rmi_driver_resume(rmi_spi->xport.rmi_dev, true);
if (ret)
dev_warn(dev, "Failed to resume device: %d\n", ret);
return ret;
}
#endif
#ifdef CONFIG_PM
static int rmi_spi_runtime_suspend(struct device *dev)
{
struct spi_device *spi = to_spi_device(dev);
struct rmi_spi_xport *rmi_spi = spi_get_drvdata(spi);
int ret;
ret = rmi_driver_suspend(rmi_spi->xport.rmi_dev, false);
if (ret)
dev_warn(dev, "Failed to resume device: %d\n", ret);
return 0;
}
static int rmi_spi_runtime_resume(struct device *dev)
{
struct spi_device *spi = to_spi_device(dev);
struct rmi_spi_xport *rmi_spi = spi_get_drvdata(spi);
int ret;
ret = rmi_driver_resume(rmi_spi->xport.rmi_dev, false);
if (ret)
dev_warn(dev, "Failed to resume device: %d\n", ret);
return 0;
}
#endif
static const struct dev_pm_ops rmi_spi_pm = {
SET_SYSTEM_SLEEP_PM_OPS(rmi_spi_suspend, rmi_spi_resume)
SET_RUNTIME_PM_OPS(rmi_spi_runtime_suspend, rmi_spi_runtime_resume,
NULL)
};
static const struct spi_device_id rmi_id[] = {
{ "rmi4_spi", 0 },
{ }
};
MODULE_DEVICE_TABLE(spi, rmi_id);
static struct spi_driver rmi_spi_driver = {
.driver = {
.name = "rmi4_spi",
.pm = &rmi_spi_pm,
.of_match_table = of_match_ptr(rmi_spi_of_match),
},
.id_table = rmi_id,
.probe = rmi_spi_probe,
};
module_spi_driver(rmi_spi_driver);
MODULE_AUTHOR("Christopher Heiny <cheiny@synaptics.com>");
MODULE_AUTHOR("Andrew Duggan <aduggan@synaptics.com>");
MODULE_DESCRIPTION("RMI SPI driver");
MODULE_LICENSE("GPL");
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